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No. You got it reversed! You would inflate to 39 at the gas station! 200

posted by  Ken C on  Thu Sep 8 16:19 CST 2005
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last visit: Fri Oct 24 11:39 CST 2014
[RELATED]

You asked, "...to inflate my tires to 35 psi [cold],... at a gas station after highway driving, should I inflate to 31 psi? The door tag says to add 4 psi for hot tires...."

Tires increase their pressure as they warm up. What they mean by "add 4psi" is that you should expect the tire to show 4psi more after the tire has been driven (because it's hot) compared to the cold temperature (before starting to drive). So if you want the tire to have a cold pressure of 35psi, you should inflate them to 39psi after they've been driven. They will then return to 35psi when they cool down to their cold temperature.

Also, remember that tires change their cold pressure with ambient temperature changes. As the season changes now and it gets colder, going from summer into winter, tires loose ~1 psi for every 10 degrees Fahrenheit -- that might be a lot of deflation, if you live up north! And vice versa, of course, as you later go from winter to summer!





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